We deal with a signal processing indirect method for determining the flux components and the electromagnetic torque. The method utilizes the input voltage and current signals in order to obtain the derivatives of the stator flux. These derivatives are transformed in the frequency domain by means of the fast Fourier transform and are successively integrated in the same domain. The implementation of the inverse FFT permits us to determine the flux components in the time domain and to monitor also the electromagnetic torque. The results are accurate because the technique of the Fourier analysis is the most suitable for examining signals rich in harmonics such as the output voltages of the inverters.
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